The KGB (Komitet Gosudarstvennoi Bezopasnosti or Committee For State Security) was the intelligence service of the Soviet Union, of which Russia was a member, on Earth during the 20th century.
"Diana Winter" was a deep-cover KGB agent who, prior to 1968, infiltrated the United States' Project Hercules, and attempted to sabotage the experimental enhanced fusion bomb before being stopped by Gary Seven. (TOS - Star Trek: Assignment: Earth comic: "Brighter Than a Thousand Suns")
- The comic erroneously refers to this as the "KBG".
On 25 December 1991, the Soviet Union was dissolved, and the KGB ceased to exist. (VOY episode: "Future's End, Part I")
In Julian Bashir's Secret Agent holoprogram, the character of Anastasia Komananov was an operative of the KGB. (DS9 episode: "Our Man Bashir")